In offline mode, angi, you do not use the "accept/test/edit" features of RSLogix 5000. You simply drag, drop, and click on instructions and use the tag browsers, or type in instructions and tags by hand.
Sometimes you accidentally save a rung that's in the middle of an edit; usually I delete those and re-enter them.
But in your case you can't possibly have downloaded this program, so you're still in an offline mode and you can definitely edit the program.
An important question: are you using a 1756-DHRIO module or a 1756-RIO module ?
The 1756-DHRIO module will require that you translate those Block Transfer module messages.
The 1756-RIO module performs block transfers onboard and requires a different sort of configuration using its utility.