Easiest is to track the routing in submix mode (3-row standard format).
Ensure submix mode is selected.
Inspect the submix for each of the outputs that are needed for your routing by
a) inspecting the fader position HW Inputs or SW playbacks or
b) by pressing / toggeling the sub button on the right, which only show HW inputs and SW playbacks that route audio to it
You can have only two types of channels sending audio to an HW output of your recording interface
a) HW inputs (TM FX top row), these are the inputs of your recording interface without the latency over USB/..)
b) SW playbacks (TM FX middle row), this is audio being sent from the PC / DAW (with the typical latency over USB/..)
Reamping depends on what type of amp you have, how it is connected to your setup.
At the end what happens ....
During recording you might record your guitar input assumed you plug the guitar to an instr input of your recording interface.
Reamping means, you send this recorded signal again to the amp.
So ... what is the HW output on your recording interface that sends the signal again to the amp ....
In submix mode click to this output and ensure that you will only route this one SW playback channel to the amp output.
This you can also easily inspect by looking at the fader positions of top and middle row.
Now you need to look the monitoring not to produce any feedback loop. Click to the HW output of your monitors and turn down in top and middle row what is not needed and might produce feedback.
Special care to check for the mic input where you record the amp again. Do not send this signal to your active monitors, send it to headphones instead.
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub13