First, which model is it? It makes it a little difficult to help without that info. Having said that, you should be able to go into your apps & scroll to the right until you come to an app named "Settings". Open it & scroll to "General Management" & click on it, then you should see "Reset"...click on that & then click on "Factory Data Reset". That will completely while all the data off the phone & you can set it up again from the beginning. If you don't have "General Management", then click on the magnifying glass symbol & type in factory reset & it should pull up the correct category it's in. I hope this helps.
... View more