You cant 'stake' RLB

but you can stake your Rollbots to get extra RLB, you can also put your RLB on the RLB pool to get some of the trading fees or you can use your RLB on the RLB lottery to win some prizes if you are lucky. I think those are the 3 options that is available right now

'Staking' it on the RLB lottery seems like a good idea for now because they waived the fee so everyone can play the lottery with their RLB for free right now as of the latest announcement