There are two possible explanations for why your student(s) can't post. First, do you have the Forum set to Visible Groups or Separate Groups? If so, the student(s) are likely not in a group. And if they are not in a group, they cannot post. Also, did you set the appropriate grouping? If so, it might be that the groups are not associated with that grouping. For either, please see our help guide on how to Create Groups and Groupings.
The other possible explanation is that you set your forum type to the Q&A Forum type, but did not post any questions. When using a Q&A Forum type you, the instructor, must post first. You are posting the "question." Students then come in and reply to your question with their "answer" (hence the name Q&A). Students cannot post questions, so if there are no questions posted, students are unable to post in the forum. Question posts are not brought over when importing or restoring course content, so they will need to be re-posted each term. Please see our help guide on using the Q&A forum. If you are using groups with your Q&A forum you must post the question to each group. If you do not post the question to the groups, students can see your post, but cannot reply. Please see our help guide on using the Q&A forum with groups.
This can happen for two reasons:
To see the forum participation for each student you will want to view the Forum Summary Report. For more information, please see our help guide on the Forum Summary Report.
Unfortunately if you have already graded the Forum the max grade cannot be changed. To change there are two options:
Is the forum hidden on your course homepage? If a forum is hidden on the course homepage, it will also be hidden in the gradebook. From your course homepage, click on the three dots under the forum and click Show. The grade should then be visible in the gradebook.
If it is visible on your course homepage, the grade might be stuck between hidden and visible. Go to the gradebook Setup page. For the forum click Edit and then Hide. Click Edit again and then Show. Resetting the visibility it in this way should make the grades visible.
You can choose to grade a forum using Ratings or Whole Forum Grading. You will want to choose only one because if you enable both there will be two columns in the gradebook for that forum, one for each method. Hopefully you haven't yet entered grades, or have only entered grades for one method. If so:
If you have entered grades for for methods, the only method that can be removed is Ratings. Whole Forum Grading cannot be removed after you have entered any grades.