Apps are available on the App Store™ that allow copy/paste on the keyboard itself. Note: We do not endorse any of these apps.
Open Settings, then General, then Keyboard. Then select "Text Replacement". From there paste the text generated from the tool into the "Phrase" section. Input the phrase you want to use to access the text in the "Shortcut" section. Choose "Save" to finish. In Instagram™, simply type in your phrase to access it.
Select "Keyboard".
Select "Text Replacement".
Click the plus on the upper right.
Follow the directions above.