I’m sorry to tell you but –
If you don’t have access to a computer or laptop you can’t do writing online.
And I’ll go as far as saying you should own a laptop or computer if you want to make a living as a writer.
No matter what type of writing you’re doing, such as writing your next (or first) magazine article, writing blogs for yourself or others, or working on essays for college, a writer needs to have a reliable laptop to work with.