やさしい・日本語はなす・少しだけかんじだ。ふりがなを書いてください。
やさしい・にほんごはなす・すこしかんじだ。ふりがなをかいてください。
If I wrote that right, it should say:
Easy/gentle ・ speaking Japanese ・ a little kanji. Please write furigana.

This is the easy section of the guild.
Do not use romaji. You can use a bit of kanji, but try not to go too far. There are some common kanji that most of us will probably see on a regular basis and get used to even if we didn't properly learn those kanji yet. For example, 日本語　（にほんご, "Japanese language"） or 勉強　（べんきょう, "study"）. Try to mostly just use grade 1 and grade 2 kanji if you can, though.
List of grade 1 kanji: http://japanese.about.com/library/blkodgrade1.htm
List of grade 2 kanji: http://japanese.about.com/library/blkodgrade2.htm
NOTE: This website has inaccurate readings for the kanji. Their list is good, but please use other sources to learn the readings and meanings for the kanji.

Try to speak on a fairly basic level. Just use basic particles like は、が、を、で、に、と、の and try to make your sentences and vocabulary fairly simple. I encourage you to use words and compounds with the grade 1/2 kanji, though, and feel free to use some other common particles like まで、だけ、から、だから.

And if you remember, I mentioned "furigana" in the title. Furigana are characters that act as a pronunciation key. Have you ever seen kanji with small kana characters on top of it? Those little fellows were furigana and they were telling you how to pronounce that kanji.
So, yeah, please write furigana if you think your kanji is slightly tough for newbies. You can either include it in brackets after the kanji or you can copy+paste your post and make two copies - one entirely in kana and one with kanji. Example: ふりがなを　書いて　（かいて）　ください.

You can speak in English if you're correcting someone. Try to correct them in Japanese if you can do so in a simple manner. Do not use romaji.