Not to get into all the safety aspects of proper anchor use,you need a good anchor.If you know where the structure is,and you want to fish over or near it,back off a distance from the structure,and drop anchor with the wind at your Back preferably.Slowley release rope and allow the wind to drift you over or near the structure.Once you are in position,snug off to hold your position.
This is basic instruction mind you,u- tube how to use an anchor with a kayak,you will get more info than you can process,hope this helps.