You can add a contact to a prospect in Prospect View. Simply click the + at the right of the "Contacts" tab.

Add a contact
The "Add contact" popup lets you enter the first and last name, email, job title, buying role, status, address and phone numbers, and whether this is a working or the main contact. You can also paste in any profile urls (like a LinkedIn profile or Facebook page) under "Contact urls:". Click "Create" to save it.

Add Contact popup
Any custom contact fields you have added will also be shown.
When you add a phone number and the contact's country is not known, the default country (set in Workspace Settings) is used for the country code.
Find contacts on LinkedIn
A powerful method for finding and adding contacts is the LinkedIn search tool among the prospect's link buttons. Click it and a window opens to the left of the ProspectSafari window with a LinkedIn search for the company (we recommend you reduce the width of the ProspectSafari window to about 2/3 or 3/4 of the screen width and move it to the right, to allow space for this window on the left).

Use the Linkedin search tool to find contacts
Provided you have installed the ProspectSafari Extension, right-click a person's name or profile picture in the LinkedIn results and pick "Add contact". Chrome asks whether to add them to a prospect you already have with that company's LinkedIn page, or else to the last prospect you edited (usually the one you have open); if you click Cancel, you can add them as a new prospect instead.
When you are on a person's LinkedIn profile, right-click anywhere on the page and pick "Add contact". The same questions follow. To add the company from their "Experience" section with them, right-click the company and pick "Add company with contact".
If you choose to add a new prospect, ProspectSafari adds it to the "Default list" set in the extension's panel. To change this click on the extension icon:

Select the extension icon
And then select the list under "Default list" in the panel:

For more information about the extension's panel see the tutorial here.
ProspectSafari takes the details listed in the profile's "Contact info" (email, personal websites, social urls) along with the name, picture and job title. LinkedIn only shows full contact info to some people, for example your 1st connections, so revisit the profile and pick "Add contact" again if/when you become connected to a contact of interest: the same contact is updated with what LinkedIn shows you then, instead of a second one being made.
Add a name or email from any website
In general when browsing you can add a contact's name or email address at any time. Simply select it, right-click and pick "Add as contact". You can add it to the current prospect in ProspectSafari or create a new prospect. Text with an @ is added as the contact's email; other text becomes the first and last name. A selected phone number is not saved as a phone number: add it in the contact's popup instead.
After a contact has been added it can later be edited. See Edit Contacts for details.
Merge contacts and see where they came from
You can merge any two contacts of a prospect with "Merge" in a contact's three-dot menu ("Merge <contact> into:"). The contact you pick keeps its data where both have a value; the merged contact only fills what is missing.
Each contact is shown with small icons for where it came from (for example "Manual entry", "CSV upload", "Extension", "Automated search", "Website data mining") and for its profile links. Click an icon to open the link, for example the page the contact was found on or the contact's personal LinkedIn profile.