Nem app is nor letting me harvest. It’s locked?
How about some more details ? Do you honestly expect anyone to be able to help you if all you tells us is “it doesn’t work” ?
You need 10k vested XEM to start harvesting.
If you want to do delegated harvesting then you needto activate it and then wait until it’s activated. After that you can start delegated harvesting.
Please give your public address, print screen with error or sth that can help us help you 
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Could you copy paste your public address? It’s not easy to rewrite it from print screen on mobile phone.
@lisarose Ok I read it. Looks like your account is empty as tell me block explorer:
http://explorer.ournem.com/#/s_account?account=NBH6VVWTIH4RVU5D22FHCXZRMMBHHOYGS5A3N7YL
To start harvesting you need minimum 10000 XEM vested balance.
How do I buy a smaller amount?
You can buy for example on bittrex or poloniex exchange. Please before you withdraw tokens to your wallet make sure you have backup of your private key.