Click either "Compound" in the "Add" submenu on the left or click the center of the empty display panel-a menu will appear at the bottom of the page.
To select a known dye, scroll down the menu on the left and click to select. The choice currently selected will be highlighted in blue. To change the current selection, click a different dye name.
To select multiple individual options at the same time, hold the CTRL key while clicking each desired dye.
To select all of a range of dyes, click the first desired choice, hold the SHIFT key while clicking the dye at the end of the desired range.
To search for dyes by name or absorbance values, use the section on the right and enter in the desired values, then press the ENTER key. The left-side menu will display all dyes with the selected properties. Click one or more choices. (Reminder: hold the SHIFT or CTRL key while clicking to select multiple dyes)
Once all the desired options are highlighted blue, click the yellow "Add to graph" button on the lower right.
To remove a compound, click the "x" to the right of the compound name.