When creating a space, make sure you are 100% sure which timezone and currency you want to use for all of your data in your Cometly workspace. Once you select the timezone and currency, they cannot be changed. Cometly will accurately convert all data from your ad channels and sales channels into that timezone and currency, but it is much less confusing when comparing data between platforms if all accounts are in the same timezone and currency.
If the timezone and currency for your space do not match your needs and you need to change them, you would need to do so by creating a brand new space with the correct timezone and currency. Make sure you set up the new space perfectly, and replace your Comet pixel on your sales channel to match the pixel for your new space.
For more info on setting up a new space, check out the "Creating & Managing Workspaces" section of the Help Center.