There is a client seed, scroll down and click the "my spins tab" then click on "view" on the bet you want to check
You need to be able to edit it though?
The user doesn't need to be able to change it through normal interface. he can do it using the advanced controls, and the server is taking the seed so it is provably fair. also the client is actually generating the seed.
The client can change it, just not a normal user. This makes it TOTALLY provably fair.