How to put camera function application not showing in power save mode anymore

A couple days ago i was trying to take a photo om powersave mode, but when i looked for the application it was no longer in the limited app selection. How do i reboot it to put the camera feature application to be back in the the power save mode? Ive used my cell from tmobile since jan 2018 but it is malfunctioning now what am i supposed to do to get this glitch fixed? Also, a seperate problem. when im online shopping on gap the site keeps crashing and reloading, and sometimes it selects a selection when my finger didnt even touch the screen. Sometimes it keeps selecting a look at something that i didnt even touch while im scrolling down, it pops a product that i wasnt even touching on the scrrrn. Ehat is going on with my ohone?

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