Ans.2. You can search your desired profile by using quick search and the other profile search option. If you don't know the profile Id, You can search by randomly by using quick search option.
Ans.4. Yes, you can update the plan after giving the rest of the amount so it will be easy for us also to make your profile visible according to the time plan you have chosen.
Ans.5. Simply you can go to the edit option where you can see the delete profile option is visible, you can simply click on it, It will definitely delete your profile.