To put an ad up on Craigslist in Brownsville, visit the Craigslist site for that location, and click Post to Classifieds. Fill out the necessary information, and publish the ad.
To find the Craigslist Brownsville site, visit Craigslist.org, and click Brownsville under the Texas heading. Use the Post to Classifieds link on the Brownsville site. Choose a category for the ad. For certain categories, you must choose an additional subcategory. For example, if you choose the For Sale category, select the type of item you're selling.
Fill out the ad information, including your email address, a title, your postal code and text for the body of the ad. Additional fields vary based on your ad's categories. Although you must enter an email address, Craigslist offers an email relay system that anonymizes both users' emails. Click Continue when you complete the page. If the categories you chose allow images, you can upload images on the next page. Click Done with Images.
The final page is a review page. Click Edit Text or Edit Images to make any changes. Once the ad is ready, click Publish. Check the email address you used for an automatic email from Craigslist. Open it, and click the link to confirm your ad.