You can't sell your NFTs if no one can sees them. Boosting your listings puts them at the top of the search page for everyone to see - and on the homepage as well.
Click on "Create ad"
Items to promote:
You can select the items you want to boost, you can boost as many as you like. The total budget is split between all items. So if your budget is $10 and you have 5 items boosted, each item gets a $2 budget
Start and End dates:
When your ad will start and end.
Total amount to spend on the campaign
Mintable uses CPC (cost per click) so you can set that here.
Automatic - then every day the CPC will be automatically adjusted so that your ads remain within the top ads shown. (suggested)
Manual - if you select manual then your price is set by you. If the average price for all boosted items is 0.50 and you set yours at 0.10, your ad will probably never been seen as others will be shown first. (not suggested)
You will be asked to pay for your promotion via your wallet - using ETH. After you submit the transaction, your ads will be created and automatically be shown.
If you have ad credits you won't need to make any payment, it will automatically deduct from your ad credits.
You can cancel your ads at any time. You can also edit the details of each ad.
If you cancel your ads, your remaining balance will be credited to your account and you can use them for other ads without needing to pay.