Click the Help tab in the upper right corner of the options screen. There are detailed instructions to help you through step-by-step using the plugin.
Still having problems? Check out the readme.txt that provides similar instructions in a bit of a different format.
Still having issues? Post a question in this forum being as descriptive as possible. What version of WP, WPML or MSLS are you using? What are the issues? Are there other plugins installed / activated that could relate? What else have you tried to solve the problem first?
You made a backup right?
No seriously. This plugin does modify meta data and options in your database and with anything like that you should always have a backup before using something new. It’s built to the best development standards I’m aware of but if you found something which is a potential risk or could be built better, I’m always happy to learn how to improve my art of code.