Open your SYRIUS Desktop Wallet.
Click on the gear ⚙️ icon in the top navigation menu.
Click on the Plasma tab in the top navigation menu.
Under Plasma Options, enter the amount of QSR to use generate plasma. It's typically recommended to have 120 QSR fused to an address to have a High Plasma status.
Under Plasma Options, click in the Beneficiary address field and then either enter the beneficiary address which'll receive the Plasma, or click on an address on the left of addresses under the Plasma Stats section, it'll automatically enter the address into the field. You may generate Plasma for any address, even one that doesn't belong to you.
Click on Fuse.