Hi, am i reading this document right ? or this document have typing mistakes

 
Click in Logical Name column (typically the left-most column) of the second newly created row and type the name of the database (as chosen in step 3 above,) then underscore, then index (eg. if the name of your database is 'sepmdb' then you should type: sepmdb_index). Click on the Filegroup column for this row (typically the third column) and click on the drop-down box. Click on <new filegroup> and type: FG_INDEX next to Name and then click on the OK button.
Click in Logical Name column (typically the left-most column) of the third newly created row and