How to specify the system database location when installing SQL Server?

It seems that we can't specify a location for the system databases when installing SQL Server. I want to know whether this is true. Take a look at the image I attached.

Thanks!

For completeness, I'll add a link to the correct procedure for moving system databases - just in case you already installed in the default locations and later wish to move these databases.

StackExchange Database Administrators Q#19381, answer score: 3