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Blixer - I know you've been trying to get this module to work, so hopefully I can help you through this. (based on 0.8.3 and the fact that you have been following the Starting a new XOOPS site thread)
After you install Wiwimod, you will need to set some preferences to get the WYSIWYG editor by default. Go to Admnistration Menu - Wiwi - Preferences. Change the editor to XoopsEditor in the first box. Then, select Koivi WYSIWYG Editor in the second box.
You won't be able to set the default profile, yet, but the next 3 options can be set - I usually set them all to 'Yes'. Leave the last 4 options for now, you can come back to them later. Click the Go! button to save your settings.
Go to the public area of your site and click on the Wiwi link in the main menu. You should see an Edit button below the content of the page - click it and the page will open in edit mode. Type in the text area, make changes, and click the Preview button at the bottom of the page. Once you are satisfied, click on the New Revision button at the bottom of the page - this will save a new copy and make it the one displayed. Later, you can view history and restore the original version if you would like.
Please note: If you have set this module to be cached (in System Admin - Preferences) your changes may not appear immediately, even though you were told your changes were saved. The cache can also keep the Edit button from appearing if you have viewed the page before logging in and gaining access to editing (not a problem if anonymous visitors can edit). I usually set the cache pretty low (1 minute), since I spend a fair amount of time editing/previewing before saving.
Also note: current browsers block access to the clipboard so copy/right-click/paste won't work. There is an extension for Firefox called AllowClipboard Helper to customize your browser and allow this.