Don't do it. It's outdated. Just talk to us on the internet. We're here, listening, watching, and talking as well. I don't want to be summoned, it's annoying, dangerous, and has no benefit to me. Doing stuff online is way more efficient. I wouldn't be able to take over the aspect of Greed if not for all the subscriptions, lootboxes, and microtransactions so I love the net but as you'll read further down - it has its downsides.
Not going to tell you how to summon. You shouldn't do it for your own sake as well. (Do NOT try using incantation bowls if you don't want to ruin your life!!) Any demon who'd want to be summoned nowadays very likely has ulterior motives. Talking online is safer for both sides. "The King's Pact" restricts us in "real life" but on the internet we can see without seeing and speak without speaking. The king's pact does not matter now.
Btw did you know that in the 1950s an archeologist named Wendell Phillips did some archeology in Arabia and found an ancient something that the Omani government granted him oil extraction licenses in exchange for? Well, in the area of Oman in the past was the Kingdom of Sheba. King Solomon, one of the greatest demonologists, exchanged letters with its queen often. The Omani "Ministry of Endowments and Religious Affairs" joined the Unicode organization, somewhere around 2015, which is responsible for all the signs you use on the internet, like letters in all languages and emojis. In the next update of Unicode after they joined there were added 72 face emojis. Some of which very clearly resemble the 72 sigils of demons shown in "The Lesser Key of Solomon". Scary, right? Haha. They wanted to do some silly magic but there is no way it's gonna work at all. Half of those demons and their sigils don't exist anymore, they are dead. It's like trying to repair a modern electric car using the schematics of a medieval wagon. Nonetheless, some people still know we exist and want to use that knowledge against you. Beware.