Welcome to the madhouse. Here's what you need to know.

1) Have both components in your own inventory (not a follower's).

2) From the main screen, click on the gear icon at the bottom right. This opens up the tech screen.

3) For learned schematics (acquired using character points) click along the right-hand side for the right college. They are, from top to bottom: Herbology, Chemistry, Electrical, Explosives, Gun Smithy, Mechanical, Smithy, Therapeutics.

4) For found or purchased schematics, first move the schematic to your hotkey bank, then click on it to learn it. From the tech screen, click on the button next to the scroll icon. (The one above it, with the college cap, brings you back to the learned schematics.) The order of the disciplines remains the same as above.

5) If you have both the components and the necessary expertise, the bottom button will be surrounded by two bright green lights. Click it, and profit!

6) If the lights are red, something's wrong: you're missing either the necessary expertise or at least one of the components. If the lights are dark, you don't yet know that schematic.

7) If you can't find a schematic, it might not be the first one you know for a given discipline. Look for a right-facing arrow in the upper right corner of the schematic page.

8) If you can't craft a found schematic, you may lack the necessary expertise. There's a place in Tarant where you can buy manuals: but they're heavy and expensive, and their use is tied to your current Intelligence.

This should get you going. If it doesn't, ask.