WPS shows add-ins only once a file is open, and asks for permission the first time. After that, Sumlion is a tab on the ribbon in both 表格 and 文字.
Close every WPS window, start WPS again and open a spreadsheet or a document. The tab does not appear on the start page.
WPS asks whether the add-on from Sumlion may run. Click Allow. It asks once for 表格 and once for 文字 — WPS's standard question for any third-party add-in.
The Sumlion tab is on the ribbon next to the others. Click it, then the Sumlion button, and the pane opens.
Make sure a file is open, not just the WPS home screen, and that you clicked Allow rather than dismissing the prompt. If it is still missing, run the installer again or use the green install guide.
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