1) Delete Button is your friend, use it if you need to rewrite your comment and add more info, instead of making triple posts, the same applies if you somehow duplicate your posts.
2) You can't change tags as a newbie, you need to be given privileges by a mod, there is a forum thread for this. This has been blocked from new accounts because trolls would pop out and modify the tags, it was so bad that we once had to work for weeks to fix the damage a few trolls did to the tagging.
3) Yukkuris are omnivorous, they eat meat alongside sweet stuff and other stuff, only super bitter stuff (coffee tier) or spicy stuff are a problem for them, and this 2 depends if they have sweet filling or not.