Why are people recommending this baby be given people food? Human food does not contain the proper nutrients a tiny kitten needs.
First, get her in for a check up with the vet right away. Continue with the KMR as you begin offering canned kitten foods. Expect messes!

You can mix the KMR with canned kitten foods, or use it to soften kitten kibble also. I rescued my now ten year old boy at about 5 weeks and he had no trouble eating kitten food.
congratulations on your new baby!