Hi Frank and Welcome to the Tree.
If you have gone through all of the Suggested Matches and Rejected or Matched there, an ADD button should appear on the line of each name that had no Suggested Match. Clicking that will permit you to add these names to WIkiTree.
On those you had Suggested Matches that you Accepted. You click on the Compare Button again and then the Edit Button on the next page. A word of caution here on Matched Suggestions. I strongly urge that you do not Merge any of these through GEDCOMpare until you are familair with Sourcing and Formatting of Biographies. If you only have one ot two data points to add to the Existing Biography, it is easier to add those to that Profile Manually. Merging your data to an Existing Biography can sometimes be a bit messy. Also, it is a courtesy to Private Message the Profile Manager of that Profile of your intentions and work with them.
Here is a page I made up that tries to cover a lot of the basics on transferring your GEDCOM file contents to WikiTree.
GEDCOM File Usage Primer