Hi there happy to help.
Can you give me the model of the Garmin?
OK, to change the language you have to go to Tools -> Settings-> Language and select English.
However if the Garmin is not in English you have to use the symbols.
Tools symbol is a Small Tool box icon.
Settings is a little blue wrench.
Language is red lips icon.
Watch this video if you still need help.........
Hope this helps,
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Have a great day.