Adding Republic Anywhere to Amazon Fire 10 Tablet

Quite awhile ago, there was a question/answer abt how to add Republic Anywhere to a Fire Tablet. I have tried to follow the side loading instructions but I’m not very techy. I think, with extra help I could try again if it’s possible. I would love to be able to use Republic’s texting program on my Fire Tablet 10. Is there someone who has been successful using RA on their Fire Tablet 10? Thank you!!

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