Going to the link you provided: "This site is untrusted". That's what Firefox says; I'm not a tech guy but I'm not proceeding any further.
Also, might I ask why I'd want to invest any money by doing what you propose instead of just investing fiat money? I'm really looking for an answer to this, and it isn't to insult or knock your program. I get paid in cash, so what is the advantage of converting to bitcoin first?
Can anyone answer that?
We have a free SSL certificate, so this might be the reason for the message you got from Firefox.
The idea for now is to service people who already possess Bitcoins. Instead of letting those Bitcoin just sit in the wallet, we want to provide a way to invest them.
Further along the way, the idea of converting your fiat money to Bitcoin in order to invest through our service will bring you the benefit of reduced fees and ease of investing. In this stage you will probably also want to be exposed to a deflationary currency like Bitcoin instead of inflationary currencies like fiat currencies.