Go to the "Base" tab and press "Deploy New Store". Or in the "Create" tab, press "New Store".
Name must be unique and no spaces.
Create a symbol (Pretend you are listing your store on the NYSE and needed a ticker (4 letter symbol) to identify it.
Confirm the 7 NEAR transfer to reserve space on the chain
It costs 7 NEAR to deploy a store, this goes to the NEAR blockchain and not Mintbase. This is a storage costs as you are paying to reserver space on the chain. You can see 602929 Bytes is used
And if you click the Balance Profile you'll see there is 0.5 N left. Each time you mint, you take up more memory and this number will shrink. If your "Available" balance becomes too low, just send more NEAR to the address
soul4space.mintbase1.near and you'll be good to go.