I can't get my car into reverse.

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On CR-V, Oasis and Odyssey, remove access cover from lower steering column cover. On Accord, Civic and Civic Del Sol, remove center console. On all models, move gear selector into "N" position. Remove lock pin from cable adjuster. Align hole in adjuster with hole in shift cable. See Fig. 3.
The 2 holes in end of shift cable are positioned at 90 degrees to allow cable adjustments in 1/4 turn increments. Loosen lock nut on shift cable, and adjust if necessary. Tighten lock nut. Install lock pin.
Lock pin should not bind as it is installed. If lock pin binds, cable is still out of adjustment. Repeat adjustment procedure. Start engine, and check shift lever selection of all gears.

It cold be either try it with the car on ground. This cold have a cable problem as far as adjustment or since you h've adjusted it it may be just because the car was up in air If it doesn it on ground something is wrong internally with trans. I'd bet so have a trans guy look at tit.

You have to repost this question

Sorry thought it was a different user. But in future you should put anew post up try resetting your security system first if no manual then look online. Then check everything pointed out and see that power goes to all the systems here. And because you had the trans out you stil may not have it adjusted correctly so try wiggling shifter in park and neutral see pic

You are grasping at air I think do like I said try resetting your anti theft. If you grounded the starter and it worked then the problem is battery to engine ground so fix that. Also when the motor mount broke there may have been a ground wire going from one side of mount to other as it's rubber and would insulate and give you no ground. Try running a jumper cable from battery ground to engine and if it cranks and starts that is your problem. Meaning you don't have a ground to complete the circuit.