I swear, it’s been over a year since I’ve drawn Double Tap without glasses. Good thing I remember what I drew last time.
P. S. I talked to tech support about the username problem and did some testing of my own. When I commented as a visitor. I could choose my username once, but then I was stuck with it. A Squarespace employee told me to delete my cookies. I followed his instructions and it worked; I had the option to post under another username.
If you can’t use the username you want, try deleting your cookies. The procedure varies depending on the browser you’re using. I hope this will finally solve the problem.