Yosemite will not open an app. Security settings?

Hi. I keep getting the following message when I try to open a particular application:
"PDF Converter Pro.app” can’t be opened because the identity of the developer cannot be confirmed.. Your security preferences allow installation of only apps from the Mac App Store and identified developers"
Does anyone know what settings I need to change to open this program? Thanks
Ken Goodman

It is not advisable to change the settings for that. If you want to, you can go to System Preferences > Security & Privacy. You will see radio buttons with the header "Allow apps from."
A better approach would be to go on an app-by-app basis. To manually allow permission for a particular app, right click on it and choose Open.

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