What is the solution to fix it

I have already had the engine replaced about a year a half ago.I had to get my radiator replaced recently because mine was cracked slightly on the top. Well I did not think or know to check my transmission fluid afterwards so I am going to get gas after its been replaced an on my way to store my car looses power off an on it even cut off once at the stop sign when I get to the gas pump my car would o't crank up so I try and see if its just my battery but nope.. then that is when I established I did not have any transmission fluid not a drip. what is the solution to get my car running again?