Log into SerpWorx with the email and password you just created.
If you have an ahrefs' account connect it here.
SerpWorx will still work correctly if you're not a member of ahrefs, you just won't see ahrefs' data.
*Note: after you connect your ahrefs' account, click on the SerpWorx chrome extension icon to fully activate ahrefs functionality - 
Your SerpWorx trial is now active
Video