SQL DB Restore

Dear Team,

I have my PRD backup this is JAVA system PI 7.31 MSSQL 2008 R2 Windows 2008 R2.

I have taken this backup via SQL tool the size is 4-5 GB.

Now i have restore this DB in my quality system JAVA sysyem PI 7.31 MSSQL 2008 R2 Windows 2008 R2.

How can i start this process/restore the DB.