To get full permissions to be an editor, you need to make at least 10 edits. If you make a major edit before you have full permissions (like removing a paragraph from an established page), it will be flagged almost immediately.
A good way to practice editing is to make smaller edits, like grammatical edits or citation edits. Unsure where to add citations? Try Wikipedia's Citation Hunt.
Googling this phrase produces short articles that have been labeled for improvement. Start by finding new sources and adding & citing new information to these "stubs."
Women in Red refers to a project to make lists of women in all subject areas who are notable and should be included on Wikipedia. Working on a Woman in Red means creating a new article from scratch. Don't let this stop you: you can always start with a stub, and work to expand it later!