First, update your Instagram app. The updates are available with the newest version of the app. Once you update and open the app everything will look the same as usual. There are no major layout changes that come with the update.
To use the paintbrush, first take a photo or video using the in-app camera. You can access this camera by selecting the camera icon in the upper left corner of the home screen. Then take a photo, video or Boomerang of whatever you’d like to capture. Once you have the perfect photo, video or Boomerang select the pen icon in the upper right corner of your screen. You should see the usual options for drawing and one additional option next to it. This additional option is the rainbow pen. It looks like a little heart and star in a circle and is next to the word “Done.” Select the brush and adjust the size of the brush using the most left dot at the bottom of the screen, use the slider to select the right size brush. Then you’re ready to draw.
To use the stickers the process is similar. Take the perfect photo, video or Boomerang and then select the stickers icon at the top of the screen. It’s the one that looks like a little square with a face. In the middle selection of stickers you’ll see the usual “location” and temperature stickers. Scroll down until you see the sunglasses sticker that has rainbow lenses, next to and below that sticker are the pride stickers.