The "census" of 1940 was conducted by the parishes making extracts from the church records (no-one went house to house and asked questions ...).
The extract you link to is from Karlstad domkyrkoförsamling, and in the left column is the page number -- 7426. The only complication is that AD hasn't filmed it -- so you have to go to Riksarkivet to find the original: Karlstads domkyrkoförsamlings kyrkoarkiv, Församlingsböcker, SE/VA/13273/A II a/19 (1934-1949), bildid:
00034487_00237, sida 7426
Married 1939-07-15, and from that you can look up their marriage in the banns and marriage book: Karlstad domkyrkoförsamling (S) EI:1 (1935-1945) Bild 182 / Sida 174 (AID:
v173758.b182.s174, NAD:
SE/VA/13273), #157/1939