Just click on the "Add funds" button available in many places on Stockal. Enter the amount you want to send to your brokerage account. A pre-filled LRS form (more on LRS later) will be presented to you. Verify the information and download the PDF of the form from the website. It's likely that Stockal already has a tie-up with your bank (we have tied-up with most domestic banks to get our clients good forex rates and to help with fund transfers).
You will need to, either, just sign, scan (or click a pic), and upload it back. Or email it to an email address that the bank will provide. Easy instructions will be available alongside the LRS form.