Bend the wires over then wrap several loops of electrical tape around the wires and the end of the fish tape.
How to fish a wire between floors.
Once the string reaches the bottom go down to the lower opening and tie the cable and string together.
If you have another floor to go you can follow the same steps in the same order.
Use a coat hanger to fish the wire through on the other side and tack your cables to a stud to keep them neat and out of the way in case there is any future wall cutting.
Attach the end of the new cable to the pull string.
Glow rods can also be used to hook wires to pull them out as a wire snake tool.
From the basement or attic push the wire fish tape through the hole you have drilled.
Pull the new cable through to the destination.
Now go up to your attic or down to the basement or crawlspace and drill a hole in the top or bottom wall plate in the same wall cavity as the outlet.
Attach the wire or cable to a fish tape or coat hanger using electrical tape and feed it into the hole until it reaches the opening at the other end.
As their name suggests glow rods glow in the dark.
Once your hole is drilled you can shove a glow rod through the hole to start fishing wire attach your wire to the eyelet at the end and pull it back through.
Use the electric tape to fasten the e thernet wire to your coat hanger and pull it through the wall.
Strip about 6 inches of outer sheathing from one end of the cable then hook the conducting wires and bare copper grounding wire through the loop at the end of the fish tape blade.
Disconnect the pull string from the old cable.
Learn how with this video.
For more in depth informatino about running fis.
Run electrical cable through walls and across ceilings without tearing them apart.
Cut the pull string and tie it up in the junction box or other accessible but hidden is ok location at both ends.
Pull the e thernet cable to its destination and you re set.
Then attach your wire to the fish tape and pull it back through.
Drill hole into wall plate.
Have someone at the other end reach through the hole in the drywall grab the fish tape and pull it through with about a foot sticking out of the hole.
Drop a string from above instead.