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Now, I'd like some help on an exponential line.
That's more complicated. The site you are using cannot do curve fitting (AKA "non-linear regression"). If you are really determined and comfortable in using MS Excel, I could provide instructions on how to do it in Excel. There are also many specialized programs that do the same but most of them can be a pain to learn.
A related suggestion: Include pre-TSM point on your graph. I.e., 60 units (that's what your sig says) at Week 0. Your graph looks great in that the trend is very clear. That's what really matters!