(From manual)
Coordinate Only Designation:
When the JTAC does not have line of sight to the target (often the case with Type 2 and 3), it will only be able to designate the target as a MGRS coordinate. The easiest way to target the coordinate is to make the red triangle data link symbol on the TAD your SPI. You can also create a new waypoint using the coordinate and select it as a Mission point from the CDU.
After receiving the point data, the JTAC will clear you to engage.
After your attack is complete, press \ and press F1 "Attack Complete".
Smoke Designation:
After receiving the point data, the JTAC will ask you to report when you are IP inbound. When you are ready to proceed from the IP to the target, press \ and F1 "IP Inbound" to start your attack. If you are inbound from the IP, the JTAC will then tell you to continue.
At this point, you need to wait for the JTAC to mark the target with smoke. When you are within 10 nm of the target, the target will be marked with white smoke and the JTAC will radio that the "mark is on the deck". Once you have a visual on the smoke, press \ and then F1 "Contact the mark". The JTAC will then radio back the location of the target from the smoke marker.
Once heading toward the target, press \ and then F1 "In" to indicate that you've started your attack run. If all looks good to the JTAC, he will clear you in hot. If not, he will abort the attack. Once you have released your weapon, press \ and then F1 "Off".
Depending on the results of your attack, you will either be cleared to re-attack or cleared to depart. If cleared to re-attack, you need to start the process again from the IP Inbound stage of the attack.
Laser Designation:
If the JTAC has tasked you to use GBU-10 or GBU-12 laser-guided bombs on the target, it will laser designate the target for you. During the 9-line, the laser code that you should search for is listed (1688 as default).
Which as already said can be automatically searched with the TGP (targeting pod)by pressing the LSS to ON, its located on the upper right corner of the TGP monitor.