HOW TO DO HEADERS
First, you'll want to make your header and save the "code" for it, using any colors, emojis, or microbadges in the design.
You can include microbadges by finding the number for it and using the tag for it, for example:
Get your header how you like, and save the "code" for it. Here's my header and the matching code.
[c][microbadge=24091] [COLOR=#BBBB00][b]Lemon[/b][/COLOR] [microbadge=24091][/c]
Then you'll want to put it somewhere for quick use. If you already use a snippet tool, then great. Here's two options that I know of that are pretty easy to set up:
Option 1: BGG Quickbars
In the top right corner of BoardGameGeek, you'll find your Quickbar.
On the next page, find an empty row. Enter a nickname for the link in the Label field, I suggest your character name, for example "Wadsworth".
In the URL field, you'll want to copy and paste the following snippet into it, replacing the word "CODE" with your actual header design "code".
'; var t = document.getElementsByTagName('textarea'); t.value = b+'\r\n'+t.value;})();
Then click save! You'll see your Quickbar across the whole site. All you have to do is click the link in the Quickbar, and it'll add it to the top of the active text box for you. (This might get wonky if you have multiple replies open, so be careful.)
Option 2: (For iOS users) Add it to your keyboard
I very often play from my phone (and this has a side benefit of automatically syncing to my mac settings too).
In your Settings, go to General, Keyboard, Text Replacement.
Click + to add a new one.
Enter your header design "code" as your Phrase.
And enter whatever you'd like as the shortcut. The shortcut will get auto-expanded whenever it sees the text entered. For things like this, I suggest an extra character to signify that it's a shortcut (to help prevent accidental replacements). For example, it'd be annoying to type "lemon" and have it example into that stuff up there.
Now whenever I type "=lemon", it'll automatically replace it. (I also have the option to cancel it, also.)
Option 3: (For Android users) Add an auto-complete shortcut
On Android, to create an auto-complete shortcut for a word in any text box, do the following:
1. Navigate to Settings -> System -> Languages & Input -> Advanced -> Personal Dictionary.
2. Then click on the '+' to add a word.
3. Type in a word that you want to be replaced with the header. You should probably prepend it with some special character to avoid getting frequent accidental replacement suggestions.
4. In the shortcut field add the header "code".
Now when you are typing in a text field you can just start typing the word you added in step 3 and the shortcut text should appear, which you can click on to add to the text field.