Download the image to your phone and then follow these quick instructions.
Open up Instagram and go to your profile by clicking on your image in the bottom right corner.
Click the plus icon "+" at the top right corner of the screen and then select "Story".
Go to your "Gallery" and select the image that you had downloaded.
Click on the "Aa" at the top right of the screen and type your text.
When you have finished typing, click on "Done" and then tap and drag the text to where you want it to be on the image.
Next, you will need to add a tag. Do this by selecting the Sticker icon and then the "@mention" sticker.
Type in the name of the person you are tagging and select the person's profile image when it pops up above the on-screen keyboard.
Click "Done" and then tap and drag the tag sticker to the right position.
Click "Send to" and then select "Share to story".
Once you do that, your story will be shared with your followers.
And you are done!