Samsung Galaxy Indulge

This is the first time that I use a forum. Hopefully that will entineda my regunta.
Do buy a Galaxy Indulge used and I want to open my account of FB and Google but still the person k me what sold, K can do to remove it and put my account?
Thank you in advance.

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Adding an account:
1.Open Settings, the tap on the Accounts & sync selection
2.Tap on Add account
3.Select the type of account to add (Microsoft Exchange, Facebook and Google are available by default)
4.Follow the on-screen instructions to configure your account (depending on account type, you will be asked to select what kind of data to sync to your device)
5.When complete, the account is added to the list in the Accounts & sync section and data will begin synchronizing to your device

Removing an account:
1.Open Settings, the tap on the Accounts & sync selection
2.Tap the name of the account you wish to remove/delete
3.Tap Remove account
4.Confirm that you want to remove the account by tapping on Remove account or tap on Cancel if you selected the wrong account
5.Your account will now be deleted

Source:
How to add or remove Gmail, Exchange and Facebook accounts on the Samsung Galaxy Indulge - Know Your Cell