This is my own ipad and it doesnt belong to any kind of school or other entity, I can manage account and passcode but I am not able to modify restrictions.
I would try other solutions before try to reset.
Thank you again
Mr. Paul
Did you buy it new, or second hand? If second hand, did the previous owner restore it to factory condition before handing it too you: if they did you would have had to go through several setup screens after turning it on.
If it was not handed to you in this conditions it is possible that the iPad retains the management restrictions from the prior owner. The only way around this will be a full restore of the iPad. If the Settings > General > Reset > Erase All Content and Settings option is not available you will have to do it through iTunes on a computer.
Unlike the reset recommended before, this will delete everything from the iPad. You will be able to re-download all your Apple iStore purchases, but any documents or other data contained in apps will be lost, so save them off to a computer or cloud service first. You will not be able to restore form a backup, as that would just restore the settings you're trying to get rid of.
If you did buy the iPad new, and if there is an Apple store nearby, I'd get an appointment and have them look at it. And don't forget, you've got 90 days of free Apple tech support. If you are still within that period can can call them for free. Might as well use it and see if it helps.