Lots , and Lots of technical issues ...

Soo , I have this problem , i tried reinstaling league of legends , but when i double clicked it , the "LeagueOfLegends" Logo appeared as normal , and it started booting upp , i waited 30 minutes , and nothing happened , it dissapeared from Task Manager all togheter , Well , than i tried to install it using the Garena launcher , It worked fine , but i Still have no idea how to change my region there back to EUNE.. Please Help
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