BarTzi

Yeah, that's ED's mission. In this mission the jet is not equipped with a targeting pod (can't turn it on if it's not mounted on the jet). You can also use the stores page or external view to understand what's mounted on the jet.
No you don't have to carry or use the TGP at all to fire this missile. It's laser guided, so someone has to lase the target. You can use the TGP to lase for yourself, but in this case Darkstar (the JTAC) is supposed to lase for you, so no TGP is required.

You are aiming for the ICLS markings on the HUD, which you shouldn't do (also try to be on speed when you approach). Not sure how it is in real life, but in DCS the ICLS is good enough to bring you to a point in which you can identify and work with the IFLOLS. According to the IFLOLS, you are low, which is correct.
Also, to be fair, IFLOLS tells you what's wrong and how to fix it, just like ICLS does.