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To create a fund instrument navigate to "Product Management" and "Mutual Funds" and click the "Create" button 
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Enter the properties as follows: Type: "Mutual Funds", Default Marketplace: leave empty since it is not applicable. Status controls the listing of intruments, Visible status controls the visibility of trade buttons, i.e. whether an instrument is tradable. When an instrument is in "Phone" status the buttons for trading will open a dialog box with information on how to perform a phone order. Name: the name of the fund instrument composed by the name of the fund entity and the fund class if applicable, ISIN: 12 digits, Fund Entity: the issuer of the instrument, Fund Company: is auto-filled, Dividend Type: "Reinvest" or "Dividend", Currency: the currency in which the fund is traded, Tax Country: the tax domicile of the fund, Decimals and Quanitity Decimals both denote the number of decimals used for amounts in orders, transactions and positions. Multiplier should always be 1 for fund instruments. Price is last known price (NAV) for the instrument and Price Date is the date of last known price.
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To continue making the settings for the instruments open it by finding it in the product list and click on its name.
Execution Interfaces
To enable trading of an instrument, settings must be applied for the instrument for each order type. The set of settings for each order type is called an "Execution Interface". To add an execution interface, open the action menu and click on "Add Execution Interface".
Then you will have to select the type of execution interface you want to add and will be presented with a set of properties determined by you selection.
You will find information about the settings for each execution interface type in the documentation of the various order types: