There are two ways to post a picture
One
using this
button. Just click on this button with the cursor at the place where you need to insert a picture. Clicking the button will open a dialogue box for you. Insert the url of the picture in the dialogoue box, hit enter and you're done
Two
Have an account at photobucket.com. Upload the photos to that account and then by mouse-over the photos you should be able to see an IMG code. Just copy that IMG code and paste it in the post where you want the image to show up.
For Bold Text
Use this
button to make the text bold
This button in the top right of the edit box will enable Enhanced Editing, it's much easier and useful, do try it
Regards