Station upgrading, not clear how to do it.

[maxolina]

It's not very clear to me how station upgrading works.

Let's take the BoFu Chemical Lab M that the plot wants you to build.

It says "Upgrade M Ready" under info, what exactly do I need to do now?

Build a BoFu Chemical Lab L blueprint from my SpaceLab Headquarters (which I have)? Can I apply the "L" upgrade to my "M" station, is that how it works? Then what, how do I apply the upgrade to the station, do I have to hire another TL again?

I've looked at the surivival guide but it's not very clear how to do it in practice, it only explains what it does in theory.

[X2-Illuminatus]

For upgrading an M station, you need a TL station transporter with Build Command Software Mk2 as well as a Station Upgrade Kit M. Go to the cargo menu of your TL ship, and select the "Upgrade" option from the Upgrade Kit. Afterwards you get the stations displayed for selection which are ready for an M upgrade -> to L upgrade. For the next level you will then need an Upgrade Kit L, and so on.

[Cycrow]

Also, you can apply the upgrade kits via Hired TL's as well. Most Hired TL's should have the right software installed for it