You can change to Don when your current Guido membership expires.
Assuming that you don't already have further Guido memberships purchased and queued to kick in when your current membership expires.
If you have auto membership renewal enabled then you should change it from Guido to Don if you want to move to Don from the next membership renewal date and thereafter.
If you buy a Don membership now it will be queued to kick in when your current Guido membership expires.
If you need to switch to Don before your current Guido membership expires then you will need to contact 48 support and see if they can facilitate this.
See the link in my signature below.
Hope this helps.
