I’m trying to claim my sister as a disabled dependent is that the same process as just claiming a dependent I didn’t see disabled as a option.

You do not have to enter anything about her being disabled unless you pay someone to take care of her while you work.  Otherwise, you just enter her as a dependent as a qualified relative and you get the $500 credit for other dependents.

IRS interview to help determine who can be claimed:

https://www.irs.gov/help/ita/who-can-i-claim-as-a-dependent

https://ttlc.intuit.com/questions/3113432-who-can-i-claim-as-my-dependent