Write to hello@igotthetab.com and a person will read it. Include your account email if it is about your data.
A scan got it wrong. Tap the item on the review screen and pick the right food. Tab remembers the correction and uses it next time.
My calorie target changed. After about two weeks it stops trusting the formula and starts using your own logging and weigh-ins. Progress → the number and its reasoning are both there.
How do I cancel? In the App Store or Google Play, under your subscriptions. Settings → Subscription links straight there. Cancelling leaves Pro running until the period you paid for ends.
How do I get my data out? Settings → Export. Everything you have logged, as a CSV.
How do I delete everything? Settings → Delete account. Immediate, and not recoverable.
Tell us what you were doing, what you expected and what happened, and say which phone you are on. That is usually enough to find it.