To fund a loan you need only the following:
If its a USD based loan you might need to get the lates USD rate by pressing get USD rate (costs 0.05 ETH for oraclize). It takes 1 min (2 blocks) to get the rate updated.
Would really recommend reading the whitepaper and getting to know Ethereum / ERC20 tokens a little more.
The error message you're seeing is most likely caused by not having an extension like metamask installed (which is how you're browser can talk to the ethereum blockchain).
Browse some of the filled requests and compare the loan amounts with the collateral amounts and associated market value to get an idea of how the financial side is structured. It's a peer to peer loan dapp which means its up to the users of the platform to settle on mutually acceptable terms.