First and foremost, AstroChallenge is a website where amateur astronomers can keep observation journals and share them with the community. There are other functions as well, such as observation details of a large database of astronomical objects, finder charts and challenges. Challenges are fun lists of objects that earn extra points when observed. What are points good for? For fun and bragging rights, of course.
To post an observation, you must have first registered for an account and be logged in. Now click on the "Log Observation" button in the header and choose which type of object you'd like to make an observation for (Solar system or deep space). You will be taken to a table of objects. Here you can search and sort the items; once you have found the object you are looking for, click the row. You will see a "Log observation" button on the left hand side under the name and image of the object. Click that button to bring up the observation form and log your observation!
Probably because it doesn't yet exist in our database. If you find something that is missing, contact us and we'll be sure to add it.
To view your observation journal, try this link or click the profile link in the dropdown at the upper right hand side of the screen (where it shows your avatar and points). To view another user's journal, visit the user directory and select the user you'd like to view.