Gillian McKeith used to claim to be able to assess your health my examining a Tupperware box full of your excrement, but I think she was only going through the motions.
On an iPad, you click the erasure-looking icon on the top right hand corner, and then click top left side until "paste" comes up. Then click that.
On android, click the share button, copy link, then paste it direct into message on thread. I delete back to the "?" after the long number and it works for me