I think this site should add features like:
-allowing us to change colours, fonts, size of the words
Profile pages are currently being revamped and may look closer to what you have in mind. However fonts and word sizes won't be customizable in order to preserve consistency across pages (same reason why
Facebook or Twitter only allow subtle changes to their profile pages).
-allow adding a photo when sending a message!!
While I agree it would be a cool feature to have, it would require a lot of work to add it. Penpal-Gate is not a company: it's a volunteer project that I try my best to maintain during my free time.
-not limiting the topics of notes
Topics of notes are merely there for inspiration. You're free to write about anything you want in the "Something to tell the world" section.
-make the sending message page different. it is quite difficult to scroll back up to old messages,have a achieve according to days.
I too agree it's one of the pages that could use some work. It will be done, although probably not in the near future. It would also require many hours of work to improve this page.
see when the other members were last online, you don't want to end up messaging someone who haven't used the site for more than 1 year
The search engine already sorts people by last seen online. Unless you're going out of your way, it is very likely members you will come across have logged in recently. And even if they haven't signed in in a while, messaging them can be the perfect opportunity for them to come back after being notified of your message.