This is very important and should be use first before making any post or commenting this help a lot in editing your post and replies.
I gist this some best ways also to feel free when writing or editing text.
It’s has been for help to top and higher ranks on the forums.
I guess using a notepad is a choice, if you wish to use it, that’s fine, but if you don’t wish, then you can just forget about it. When you click on reply button on the forum, you have enough space to type anything you want, and you can also edit and preview your post. I don’t think there is any difference between using Notepad and posting on Forum directly, using Forum even has more advantages than using Notepad because you can preview your post to see how it looks, and after previewing your post, your post will automatically be saved in draft. So I don’t really know why you think using Notepad is really useful on forum.