If you have a computer and are savvy enough you could set up a reminder. You can also find free services that will do this for you and send you a reminder email. Have it tell you to take your blood pressure and have it repeat until you have taken it and then delete it. Make it do this daily and you will remember to take your blood pressure medicine.
You can easily come up with your own creative ways of remembering to take your blood pressure medication. Try a few different ways and see what works best for you. Once you get into a routine of taking it you shouldn't have a problem remembering to take it.