Help please I have a 98 Olds mobile that I cannot get to start right away

What is your question?

I was told it was the starter so I changed it and now I'm still having the same problems I was having before it does not want to start and now three times the security light has came on and I have change the coils on the car

What makes this problem better or worse?

Jiggling the key and I think banging on the battery and pushing some sensors in

How long has your 1998 Oldsmobile 88 had this problem?

A month and a half