Hi atlanticspringer, and welcome to the forums.
That's a fine photograph, and of course you may enter it into the competition, it's open to all members. You will have to actually 'submit' the picture though.
The process is a little long-winded at first, but when you've done it once or twice it becomes easier.
Firstly you have to optimise the picture to no more than 100kb, you can do this using an online optimiser such as
this. Then you need to enter the photograph into the competition
here. Select 'Upload Images' in the right-hand corner and select 'April Photo Comp' in the drop-down menu.
Good luck.