Once you have activated the Assessment by standards in your group, you can start assigning each standard to the columns. To do so, create a column with a title and a type of mark or rubric. If you have selected the Assessment by standards option in the group, a row will appear under the title of the column. Click on that row and choose the standards that will assess this activity or test you are working on.
Once it has been selected, you will have the option of the standard you want to use, with a space at the right side of the standard to enter the weighing. This will affect the value it will have when setting the final mark.