We have had 3 offer a that we accepted. 1st one the buyer financing fell through, second and third they back out.

I have a credit score of 750 and 15k in cash and was wondering how likely I am to be accepted for an HML.

I can draft these offers for you, but, as mentioned, the likelihood of acceptance is slim to none unless you're presenting terms favorable to the buyer or possess substantial experience to demonstrate your ability to close.

Unfortunately, we found out that we could not use this option since the property used window units for A/C which was not accepted for FHA financing.

A 2015 bankruptcy would be acceptable to me since it is relatively a long time.

I accepted.  

This is called a Deed in Lieu Foreclosure or Deed in Lieu (DIL).As an option to avoid a long drawn-out foreclosure process (more painful for the lender than the borrower), your friend might be able to negotiate a deal with her lender to accept the property and wipe the slate clean.

You have already accepted them as tenants and they have a right to know that YOU have authority to sign their lease.

Im just worried that my lender won’t be able to accept the check because it has my personal name on it not my llc 

The next thing you know someone else's offer is accepted because NACA did not return a call or was unavailable.