Best way to seafoam an engine is to suck up half a can (or until the engine stalls out) through a vac line as luckyedboy66 mentioned. I wouldn't put more than 1/4 can into the fuel tank. I'd just use half a can through a vac line (brake booster line works the best), and 5K later, use the other half can through the vac line again. Running Seafoam on a vehicle that's relatively new with low miles won't give you any benefit.
'11 Ram SXT 4x4 quad cab - 5.7L V8; 128,200kms
'09 Malibu 2Lt 3.6L - 140,000kms purchased 1 March 2019
'06 Pontiac G6 GT - 3.5L V6; 162,000kms (rear ended 15 Feb 2019, and given totalled title by insurance)