If you don't have an ENS domain yet for your space you can register one here: https://app.ens.domains
Go on this url: https://snapshot.page/#/my-space.eth/settings (change
my-space.eth with your ENS domain).
Copy the IPNS link in the ENS field.
Click on the button "Set record on ENS", you will get redirected to ENS app.
On the ENS app click on "ADD/EDIT RECORD".
Paste the IPNS link in the "CONTENT" field.
Click confirm and submit the change.
Refresh the page https://snapshot.page/#/my-space.eth/settings.
Now you can edit your space settings
Click "Save" and sign settings message on your wallet.
Now you are set! You can go on https://snapshot.page/#/my-space.eth to see your space.
To get a logo for your space and images for the strategies you need to do a pull request on this repository https://github.com/snapshot-labs/snapshot-spaces. You will need to create a folder with the id of your space (example: "my-space.eth"). In this folder you need a file "space.png" and "logo.png" (for the first strategy) and "logo1.png" if you have a second strategy. All the images must be squared and less than 50kb.