can’t add another currency with the plugin, maybe button not worling

i have installed the multicurrency plugin on my website as in wanna add dollars.(btw i am using woocommerce + dokan multivendor).

i am using the free version of the plugin. at the moment i only have one currency, and i couldnt add another one for some reason.

would anyone have a solution for that ?

another thing- i am looking to add few product with different currency, would i be able do that ? for example some are in dollars ans the other are in xxx currency.

any suggestions ?

many thanks