Unless the OP has a Dividend Miles account prior to 2/1/2011, he won't be able to get the 25% toolbar bonus.
25% additional bonus offer: Dividend Miles members based in the 50 United States and Puerto Rico can earn an additional 25% bonus on their "buy miles" purchase by downloading, installing and completing at least three valid searches using the Dividend Miles Toolbar during the above dates. To qualify, a member's Dividend Miles account must have been registered with a United States or Puerto Rico address on 2/1/2011.