Bushnell has an excellent archive for discontinued scopes, which the "EG" model likely is.
Place the scope tube into the lower ring cradles.
The manual explains that the (the one near your eye) is adjustable for your vision. bushnell 3-9x40eg manual
Understanding your scope's baseline capabilities helps you maximize its performance in the field. 3x to 9x adjustable zoom Objective Lens Diameter: 40mm
Your manual covers "Sighting In." Here is the condensed version. Bushnell has an excellent archive for discontinued scopes,
If you'd like, I can to other popular Bushnell models, or walk you through the steps to calculate the exact bullet drop at different distances. Which would be more useful? Share public link
Before operating the scope, familiarize yourself with its main physical components: Which would be more useful
Understanding the layout and specifications of your scope helps maximize its performance in the field. 3x to 9x variable power Objective Lens Diameter: 40mm Tube Diameter: 1 inch (25.4mm) Reticle: Illuminated Rangefinder / Mil-Dot (Red and Green)
Start shooting at a close range (e.g., 25 or 50 yards) to ensure you are on paper.