replacing a shower base

I am attempting to replace a cracked shower base.

the shower stall sits on top of the base , before I start , I just want to clarify a few things to ensure I am doing it correctly.

what connects the shower stall to the base and also the wall? is it just the sealant, or is there going to be some other attachment?

ITs just a question of how to I remove the shower glass surround so that I can get access to the base.

I dont see any obvious way that the stall attached to the wall, but clearly there is otherwise it would be loose.

So I am just a little unsure of how to go about removing the stall so I can replace the base.

Any help would be appreciated.