Setting macro security level in Excel
From ICISWiki
Before you can use ICIS it is necessary in Excel to set Macro security level from High (the default) to Medium to be able to view menus etc.
Open Excel and go into Tools, Macro and click on Security. If security is high, set it to medium. This will allow you to Enable macros when opening certain functionality of ICIS. If you open some other Excel file (that has nothing to do with ICIS) and it unexpectedly asks you to Enable Macros, you can say no. If security was set to low, it would run both type of macros without notifying the user, and is therefore not recommended.

