The memo is not required for receiving money in the LOBSTR wallet, because LOBSTR provides unique addresses for all our users.
In order to receive the funds, typically you’ll only need your Stellar federation address (e.g. “username*lobstr.co”), or (if the sender doesn’t support federation addresses) your account address (56 character string starting with “G”).
If the service that you are using to send transaction requires you to specify memo when sending funds to your LOBSTR wallet - you can safely enter just "Lobstr" there.
Never share your secret key with someone who offers to send you money!