You may notice that your current forum may not have an entry in your gradebook. If you are hoping to make your forum a gradable part of your course please follow these next steps.
In your forum's settings you will need to scroll down to the Ratings option.
The default setting is an Aggregate type No Ratings
You'll want to change the aggregation appropriately for your gradebook, feel free to investigate the appropriate type for you by selecting the ? next to each setting.
Next, choose the appropriate Scale type, usually Point but you may also choose Scale if desired. Enter the desired max grade. You may also place date restrictions on the forum as well.
Once one's forum settings are all entered, 'Save and Return to Course". Feel free to review your gradebook and set the appropriate weights with the new addition.