How/can you change your email

ive had an account that ive made 2014 with my "main" gmail and totally forgot about that account and made another one in 2015 while i started playing really much and is the account i use now but i have no idea what gmail i use there and that is trubbeling me quite much and i need to know if i got in legends of runterra. if someone knows it would be nice if u can help me thanks in advance.
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