Hi, and thank you for your question. My name is ***** ***** I'll be assisting you today.
First off, please open up Gmail - when your own Gmail account comes up, clicked on the round (circle) icon at the top-right corner of the email page, and then click "Add account".
You will then be able to sign in to the other Gmail account as well, and can then switch between the two accounts by clicking on the round (circle) icon at the top-right again; it will show up the other account there now and you may just click on it to switch to that account itself.
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