It appears in the upper left (Value in Wallet) and it is the available amount you have to make your next investment in any of the projects that are accepting contributions. It assesses the amount you have in DAI (or Ether from older projects).
You can click on the figure to access the "Wallet Information" section to show details of currencies and related actions such as withdrawals, deposits, changes. In the case of using an EthicHub wallet, you can access your private key and 12 backup words with your wallet password.
NOTE: Please keep your private key and 12 backup words in a safe place, they are the only way to regain access to your wallet, and they are in your custody. EthicHub does not have a copy.