I found that using this this mod has a little bit of a learning curve, and is a little overwhelming at
a glance, so I thought I'd share what I've figured out.

I probably missed some details, but this should be enough to get you started. I hope it helps someone.

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What does the mod do?
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1. Lets you easily rename Fleets and any attached ships, using colours and tags. It's very customisable. You can save the settings.

2. Can rename individual ships too. unfortunately this is done one-by-one, so really works best with fleets. The 'AutoMultiRenameNewlyBuiltShips' might help here if you want standardised naming. Or you can chuck all your stand-alone ships into one fleet and rename it with the fleets function, i guess?

3. Unfortunately, it doesn't seem to work with stations and their assigned ships. In some cases you can select ships assigned to stations, but it seems you can only do this for ships out of their home sector (or something? I couldn't figure it out).

4. works on other faction ships too.

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How do you use it?
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Step 1: Select any ship that doesn't have an order or assignment (it doesn't have to be the ship being renamed).

Step 2: Go into that ship's behaviour tab. Set the 'default behaviour' option to 'multirename', and it will open up with the options.

Tip: Don't panic. There are lots of settings, but they're mostly just to change the colours. Ignore any inputs that are "---------:", as if you try to use these it'll ruin the setup and you'll need to exit out and restart.

Step 3: Under 'which ship or fleet?', choose a ship that you want to rename. By default, renaming conventions will also apply to the commanders and subordinates as well. You can change this in the options.

Step 4: choose which tags and settings you want to apply. I recommend turning off the 'tag' option and maybe also the 'faction name' option (unless you're wanting to rename NPC ships too, which you can also do with this mod).

Tip: There is a 'save settings' option if you want to save your settings for next time (the second last option).

Step 5: Confirm the order, and it should apply the new naming convention to the target ship(s).