To enable voting set your block reward vote and then enable mining.
Download the heavycoin-qt wallet if you did not do this already. Install it and let it sync.
F 2: Heavycoin Voting Controls
To set your block reward vote update field 3 - "Vote on block reward".
Check box (1) - "Mine Heavycoins" and select number of threads you wish to use for mining in field (2) - "Mining threads".
You can keep track of current voting and money supply by showing detailed information on overview page of your Heavycoin wallet.
To show information about voting select box (4) - "show block reward voting on overview page"
To show information about money supply select box (5) - "show money supply on overview page"
Figure 3: Heavycoin Voting Overview
For a detailed explenation of voting and what it affects have a look at how voting works.