Hi,
Managing the orders (and also products/categories/discounts/...) from the front-end is the feature provided by "HikaMarket front-edition".
You can try it in our demo website using the account "demo" (password "demo") in the menu "Other features > HikaMarket".
The version installed in our demo website is the multivendor one, it provide the same edition features but also allow to have other vendors in your store. The front-edition one allow just one single vendor (your vendor).
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.