Login to wix

Create custom domain entry on Teachmore dashboard under Settings → Domains

NakedSSL setup

Click on get it now button on nakedssl.com and then register yourself

After email account confirmation you should see this screen

Click Add domain

Remove forwarding, so it will remove the old A record and add new one

Edit A record pointing to IP address provided by NakedSSL

(Do the following steps on Wix dashboard)

Now click DNS updated on your NakedSSL dashboard

Check DNS now

Once you see the creation in progress message, wait for 5 minutes and refresh the screen.