Learner Notes

I would like to have a tab available throughout my course so that learners can take notes. I have a slide with a text input field and have it displayed as a lightbox. This works fine, except when the learner revisits the notes page after already typing something in. The text is automatically highlighted and you cannot click to move the cursor to the end of the text to continue typing. You can click the End key or the right arrow key on the keyboard to move the cursor to the end, but I am afraid my learners won't know to do this (even with instruction added to the top of the page) and will accidentally erase the text that they have already typed. Is there a way to have the cursor automatically move to the end of the text so the learner can continue typing in the notes box?

Thanks!