1. first, make sure that the edgetools plug-in is installed in su. You can check whether the plug-in is installed in Su's plug-in manager, or select the extension tab in su's window menu to see if there are options for edgetools.
2. Open su software and create a new model file.
3. Select the "Window" menu in the menu bar of su, and then select the "Extensions" tab.
4. In the Extensions tab, locate and click the option for the edgetools plug-in. This will open the page of edgetools.
5. In the edgetools page, you can use various tools and functions to deal with the edges of the model. For example, you can use tools to add, delete or edit edges of a model, or use various options to adjust the attributes of edges.
6. When using the edgetools plug-in, you can view and adjust various settings and parameters in the toolbar at the top of the page. For example, a selection mode, an editing mode, a display mode, and the like can be set.
7. After editing the model, you can confirm it on the "Apply" button at the bottom of the page and apply the changes to the model.