Free users have a cooldown for changing their username of 14 days. For Pro users, this limit is reduced to 1 day. For more information about Pro and its features, check out the Free vs. Pro article.
Open YourSitee Account Settings
Click your avatar image to open the Account Settings. This is where you can change everything regarding your profile.
Enter Edit Mode and click Profile Widget
While in edit mode, click anywhere on the widget that displays your profile icon, username, and bio. This will open up the profile card editing screen where you can change your details.
Find the Username Field
On the profile card editing screen, scroll down until you find the Username field. Here you can enter your new preferred username.