Go to a project space.
Click on “Connect wallet” button in top right corner.
Connect with wallet provider where you hold relevant token.
Click on “New proposal” button at the project homepage.
Fill out the Title in accordance with project naming standard.
Fill out the large text field with your community proposal.
Select the desired voting options.
Now go to the “Actions” box.
Select the start date.
Select the end date (Allow enough time for voting).
Fill out the Snapshot block number (See below: Add a snapshot block number).
Click on “Publish” to create the proposal.
Sign the message via your wallet and you are done.
This number is important, to lock the state of community members who are able to vote. Meaning that if you attempt to vote on a proposal and block number is in the past, and you weren't holding required token yet, your vote will not be counted.
You can click the "?" top right the snapshot website, and get the blocknumber from there.
Or just look at etherscan.io/blocks and use the last block number.