Easier said than done at times. But it can be accomplished.
Many of us find it quite difficult to sit down with paper and pen or a blank computer screen and try to come up with something to write. This, of course, can lead to frustration and cause you to feel as if you've wasted your entire day doing absolutely nothing with your writing.
STOP! If this happens, there is a solution. Pull out a spiral notebook and just write. It doesn't have to make sense, it doesn't have to be about anything in particular.
Tip: Start off by picking a word or a phrase, then come up with a sentence using that word. Build from there. The object is to simply write. It doesn't matter if the sentences even make sense to you. The point is you are taking time to write.
If you feel you don't like this exercise that much, that's okay. The point is to get your writer's mind working and let your brain relax to get the ideas circulating again. Often there are times when I'm given an assignment on a subject that I know nothing about. I get a little frustrated with the subject and decide to try, but then walk away. But then I realize that I'm going to hurt my writing time if I don't utilize it. So, I reach for a spiral notebook and JUST WRITE.
Sometimes, I will even write silly poems in my spiral and include a few doodles. Anything to help keep me in the writing mode and using that time to write. Oh sure, there are a lot of other things I could be doing that would count as part of my writing time--researching a project, creating characters, etc. But, for me, I just don't feel accomplished when I work on those parts of writing. Being able to actually put something on paper or in the computer gives me that bit of satisfaction.
Tip: I actually set up writing time as an appointment on my calendar. That way, I keep it important not only for myself, but for my family as well. When they see the scheduled time, they know that it is time to let mom write and not to bother her unless it is super important or an emergency.
It's important when you have a family to make sure you schedule critical time for yourself. If you have little ones at home, like me, I choose to work on my writing when they go to bed. This, of course, can make for a rough following morning if I get into a serious writing drive.
The point is: just write. Find a way that helps you to just sit and do so. It doesn't matter if it makes sense, it doesn't matter if you have proper sentence structure, the point is to help stop the block and keep you from being frustrated with the task at hand.
For more tips on how to find time to write, check out Time to Write: An Interview with Kelly L. Stone.