Install MathWallet https://mathwallet.org Switch Network to 'Moonriver', create or import a Moonriver wallet And you can start using Moonriver now! If you need to claim your MOVR token, using your App scan the qrcode of 'Moonriver Apps' on https://mathdapp.store/?blockchain=moonriver And you can claim your crowdloan MOVR token, same as the extension process https://blog.mathwallet.org/?p=3341