Answer:
I just looked it up, apparently this is how. I've never cancelled a Brainly subscription before, but hopefully this helps.
"Brainly Plus subscriptions will renew monthly, or every 1, 6, or 12 months depending on your subscription. You can see when your subscription is set to auto-renew in your account settings.
1. Login to your account
2. Go to your Account Settings option from the dropdown from your profile picture
3. Select Subscription
4. Select Cancel subscription
Be sure to submit your cancellation request at least 24 hours before your renewal date. "
