TM30 only for long term visa no need to inform renew again just keep TM30 first time ( if not change your address ) inform only but other type visa need to inform every time flight out of Thailand and come back not over 24 hours.

Just download TM.7

And fill up form

Document need

1. TM 7

2. 2 pictures

3. Passport original

4. Copy passport and entry stamp all page after get visa retired

5.statement 12 months and need to require certificate from bank for update statement

6. insurance

7. Fee 1900 THB

Please follow list can extend 👆🏻

If need more information please IB I am agent property management and visa all type