Installing Lightroom presets is pretty simple. Here are a few quick steps to install the Signature Series:
Step 1: Right click on the Preset panel and select create a new folder
Step 2: Name the new folder Signature Series.
Step 3: Right click on the newly created folder labeled Signature Series (located in the Preset Panel) and select Import.
Step 4: Locate your recently purchased Signature Series presets (more than likely in your download folder).
Step 5: Select all the presets using Ctrl+A (PC) or CMD+A (MAC) Next, click open.
Your new presets should now be located in your preset panel under the folder Signature Series.
Have fun and let me know if you have any questions.