Make sure you have backed up your template before installing a new one.

(You can also install a XML template).

1.

You have to choose a Html Template



2.


Copy the code (Ctrl A: Select All, Ctrl C: Copy)



3.


Go to your Blogger Control Panel - Edit HTML


4.


Revert to Classic Template (You can return whenever you want).



5.


Paste the code into the Template area (Ctrl A: Select All, Ctrl V: Paste)



6.


All done!