Zeplin lists all colors used in layers in the right panel, under the Colors tab (🎨).
Adding colors from screens
You can add colors to your styleguide by clicking the button right next to the color codes.
Adding suggested colors
If you're working with Sketch, Zeplin grabs all of the colors added as document colors and the colors you have set up in layer styles automatically and lists them under the project styleguide. To add them to the project, you can either add them all using the “Add All Colors” button or click separately on the ones you want to add.
To reorder a color, click on the color itself and then drag the color to the place you want.
You can edit names, hex codes and opacities of colors by just clicking on them. There's no character limit for color names. Zeplin remembers color names across projects as you rename them.
To delete a color from your styleguide, just click on the “⨉” icon that appears when you hover over the color. You can also right click on the color and select “Delete”.
If you want to delete all of your colors in your styleguide at once, you can click on the “…” button and then select “Delete All Colors” option from the revealed menu.