Apple 5s didn't forward more options when sending text messages.

First, please find the message you want to forward, and press this message with your finger, as shown in the figure.

Then the options menu will pop up above the message, and click the "More" option, as shown in the figure.

Then select this message, and you can see that the small circle on the left side of the message is ticked, as shown in the figure.

If you want to forward multiple messages, just click on the small circle to the left of the message. Then click the "Forward" button in the lower right corner of the screen.