right on the front page you have the Facebook button to login

if you don't see it, check if you have any plugin in your browser that might be blocking it, and also, might be a good idea to see if you see the button in a private window

after accepting the FB web application, you will get the token

and will be a valid token even if you logout

here's the output when getting info for MichaelAngelo character:

https://www.superheroapi.com/api.php/101617...9/450

{
   "response":"success",
   "id":"450",
   "name":"Michelangelo",
   "powerstats":{
      "intelligence":"63",
      "strength":"14",
      "speed":"50",
      "durability":"65",
      "power":"59",
      "combat":"75"
   },
   "biography":{
      "full-name":"",
      "alter-egos":"No alter egos found.",
      "aliases":[
         "Mike",
         "Mikey",
         "Mikester",
         "Michaelangelo"
      ],
      "place-of-birth":"-",
      "first-appearance":"-",
      "publisher":"IDW Publishing",
      "alignment":"good"
   },
   "appearance":{
      "gender":"Male",
      "race":"Mutant",
      "height":[
         "-",
         "0 cm"
      ],
      "weight":[
         "- lb",
         "0 kg"
      ],
      "eye-color":"Blue",
      "hair-color":"-"
   },
   "work":{
      "occupation":"-",
      "base":"-"
   },
   "connections":{
      "group-affiliation":"-",
      "relatives":"Leonardo (brother), Donatello (brother), Raphael (brother)"
   },
   "image":{
      "url":"https://www.superherodb.com/pictures2/portraits/10/100/10329.jpg"
   }
}