Lease question-can someone explain?

We can only make a payment of $710 out of $910 on our rent by May 1st (we’d pay the rest on May 11 which is next payday). We have a “surprise expense” due to a surgery I need and the hospital requires a partial payment.

I can do this as long as we make the additional late fees, correct?

Can someone explain what the last sentence in the paragraph in this image means?

I didn’t know where to post this, so I appreciate any help or guidance!