A suggestion is nothing but a little more specific type of forum post. Every signed in user may create one. Also, users can answer to such posts as usual. The difference is that users can support or object to the suggestion.

• to begin with, you should determine the appropriate forum for your suggestion
• look for an existing suggestion that already covers yours
• if so, simply support the existing one
• if not, create a new suggestion (preferably in English)

It will probably be a good idea to wait for some feedback in this stage. You may receive some response which allows you to enhance your suggestion. This allows more users to support it! Once it is "good", you can call for votes on it (Approve Voting, please note that you can not edit it any more then).

Btw: you may (and probably should) support your own suggestions!

A good suggestions is both concise and plausible At best, the following questions are clearly answered:

• what exactly is the issue that is to be solved?
• why is it worth spending the effort to resolve the issue?
• what exactly is your suggestion to solve the issue?