If you have not yet read the Flexibility in Reading page , I recommend you go there first. Read daily something you can read for enjoyment with intent to improve speed. Use your finger to guide your reading, since without guidance, the eye tends to jump around on the page.
Speed reading instructors vary in their suggestions.
Guide your finger under the line as you read left to right. Then circle back quickly underneath the next line, and repeat the process. This is what you may resort to as you read faster and faster, where your eyes zig zag down the page, getting clumps of content as you go. It is also recommended that you use your right finger on right pages and left on left pages, to engage the right and left brain . In addition, the kinesthetic aspect of touching the page is likely to help keep you focused.