[Q] How to uninstall default apps

I want to uninstall some default apps from my samsung galaxy ace gt-s5839i which i bought as second hand from a store and was not unlocked. I unlocked it from the 3 network, but some apps are really useless. i have put the apps i want to remove on a red circle and the messages i get when i access to some of them.please need to know how to uninstall it.
And if i need to root my phone then i need to know how to unroot it
thanks

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