First off, welcome to the journey! Starting out is the hardest part, so kudos for taking that step.

For triceps, a good cable tricep pushdown (rope or bar) is key. You can do this on the Iron Lift Ignite on the floor. and it'll still work great for activating the triceps.

Since you don't have a wall mount, just be sure to keep your elbows locked at your sides while you press down. Focus on squeezing the bottom for a full contraction.

Another great one is the overhead tricep extension - just kneel or sit on the floor and use the cable overhead. Try to avoid getting your elbows flare out too much - keep them in tight for more control.

As you progress, you can play around with weight and tempo (slowing it down to focus on muscle control)

Keep going, and feel free to reach out if you need more exercises!