Once the Inkscape window opens press Shift+Ctrl+P shortcut to open the Preferences window open then select System from the menu on the left hand side of the Preferences menu
Copy the User Extensions address as indicated in the image with a blue square. Press Cmd+Shift+G to open the Go To Folder search window and paste the User Extensions address, as indicated with the green square. Select Go and the User Extensions folder for Inkscape plugins will open
Open your web browser downloads and open the thlaser-inkscape-plugin-boxzy-2 folder. Copy shinylaser.inx and shinylaser.py and paste them into the Inkscape User Extension folder you opened in the previous action in this step, this is indicated by the blue box and arrow
Close Inkscape and then reopen it.
Insert a new line below
Insert a new line above
Indent current line
Unindent current line
Delete current line
Navigate to next step.
Navigate to previous step.