I am thinking something. If I buy advanced package, do I get to change my domain name to whatever.com or no? Or if I buy premium one, can this happen? I am not sure how this works on forumotion.

hello

please read 
-  https://help.forumotion.com/t10579-custom-your-domain-name
-  https://help.forumotion.com/t22302-why-should-i-choose-a-domain-name-for-my-forum-and-how?highlight=domain

Alright, I see. But what if I buy advanced package and then buy domain somewhere else like whatever.top .. Can I connect that domain name to Forumotion hosted forum?

The Raven wrote:Alright, I see. But what if I buy advanced package and then buy domain somewhere else like whatever.top .. Can I connect that domain name to Forumotion hosted forum?

https://help.forumotion.com/t7021-cname-redirect-an-extern-domain-name-that-you-own-to-your-board?highlight=domain

please take a look like to this forum https://help.forumotion.com/f5-frequently-asked-questions
you will find many answers to your questions

Okay, solved.