Smith Brothers makes an EZ install (not quick install) push rod and if that is what you ordered, that is what you have. You should have received instructions; did the instructions included tank removal?
If you have the SB EZ installs, you first have to get the lifter on the heel of the cam (lowest lifter position), then remove the bottom section of the pushrod that drops into the lifter; then you have to thread the adjustor all the way back up into the top section of the pushrod to gain enough clearance to swing the top section in over the bottom section; then you have to thread the adjustor all the way into the lower section until it bottoms out; then you are ready to adjust.
If you did not receive instructions, call SB and have them send you some. If that doesn't work, PM me. I think I have a set of the instructions in my files.