This depends on the status of your account.
Yes, if you are a paying customer.
We only add custom shares for paying customers - we have access to 1,000s of stocks and shares, across various markets. If you are a paying customer and would like us to add a share for you, please email firstname.lastname@example.org
If you are not a paying customer, or if you are a customer on a free trial, then apologies, but we cannot support your request. If you upgrade to a paid plan, you will be able to request additional stocks/shares.