In order to receive dividends, you will need to have the ERC20 tokens at the time of snapshot. After the snapshot, you will be able to claim the dividend in myetherwallet. For specific instruction, check with the developer. Usually there will be instruction in blog, medium or Ann thread on how to claim.
So you may or may not have to do anything? What happens if I forget about it, or am unaware of the claiming instructions? Do you have to do it within a timeframe or are they always available? Thanks