You can find support on using the Reaxys database in various places, such as the Reaxys support center and libguides. You can find several links below.
Reaxys offers a support menu in which you can find answers to various questions regarding the database.
Click HERE to access the support center.
The Radboud University also wrote a libguide with information on how to search in Reaxys.
Click HERE to access the RU libguide.
The developer of Reaxys (Elsevier) also published a libguide with basic information on how to use the database.
Click HERE to access the elsevier libguide.