How you can pay in will depend on the account you're wanting to pay into.
For Cash ISAs, you can pay in either via direct debits every month or one-off contributions in the Tembo app.
For Fixed Rate Cash ISAs, you would deposit into these as a one off contribution in the app. Doing this will start the 12 month fixed rate term
For Lifetime ISAs, you can pay in either via direct debit every month, one-off contributions via the Tembo app or by using a gift link (you can see your Gift Link in the Settings tab of the app).
For Regular Saver and HomeSaver accounts, you can pay in either via direct debit every month or one-off contributions in the Tembo app.