I'm sorry to hear that you are having trouble. The lesson plan template is a Word document; perhaps you don't have Microsoft Word? If you can't use the template, you could simply share your lesson plan in the body of the message. Please include the grade level, subject area, Big6 stage, lesson focus, grade level objective, and content standard. Then, after describing the learning activity, tell us how you will assess student performance by sharing the evidence you will collect and the criteria you will apply.
If you have filled out the template, I see a line above the box in which I am typing my message that has the option "attach a file." If you saved your lesson plan using the template, and created a new name for the file, you should be able to attach it to your message.
--janet