when you will click on the connect button then metamask will pop if you have if you not have then you can add extension of metamask wallet in your respective browser... it will ask you to allow metamask wallet to connect the website,after allowing your metamask wallet or coinbase wallet will be connect to wbsite..
in your metamask there should be more than 50 dollar to fund if you have not then you can get sepolia ethereum from infura or alchemy..
after filling the amount in the box you have to click on the fund button ..
now you can see the balance of contract in console after clicking balance button.
after clicking the withdraw button you can collect your funding amount