Steps
Check that you have sufficient balance in the asset you are trying to trade with. Your available balance is shown on the trade screen.
Make sure the amount meets the minimum trade requirement.
Check your internet connection. A stable connection is required to submit trades.
If you see an error message, note the exact wording and try again after a few seconds.
If the issue continues, force close and reopen the app, then attempt the trade again.
If you still cannot trade, go to Profile > Settings > Help and report the issue. Include the asset pair, the amount, and any error message you saw.
Questions
I see "Insufficient balance" but I have funds.
Your available balance may differ from your total balance if you have open orders or pending transactions. Wait for pending activity to settle.
The Confirm button is greyed out.
Make sure you have entered a valid trade amount above the minimum.
I get a network error when confirming.
This is usually a temporary connectivity issue. Check your internet and try again. If it persists across multiple attempts, contact support.