Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
Try this version. C/p text in the first box and click prepare. You should get 3 columns of text (gets a bit ugly, but much less laggy). Tap a word and it will turn red for remove. Hold a word to bring up a dialog box where you can add things or comments. Note that for punctuation, just remove the word and add a new version. When you are done,
click getbb for the bbcode. Play around with small examples to make sure everything works before doing a full check. Oh, if you want to get rid of an addition, click the word and it will disappear.