diff --git a/examples/testbot_instance.rs b/examples/testbot_instance.rs
index ebc58a5..5a0190a 100644
--- a/examples/testbot_instance.rs
+++ b/examples/testbot_instance.rs
@@ -153,6 +153,10 @@ async fn on_event(event: Event) -> Result<(), ()> {
 
 #[tokio::main]
 async fn main() {
-    let _instance = Config::new("test").username("TestBot").build(on_event);
+    let _instance = Config::new("test")
+        .username(Some("TestBot"))
+        .build(on_event);
+
+    // Once the instance is dropped, it stops, so we wait indefinitely here.
     tokio::time::sleep(Duration::from_secs(u64::MAX)).await;
 }
diff --git a/src/bot/instance.rs b/src/bot/instance.rs
index 1fa3374..1d15d66 100644
--- a/src/bot/instance.rs
+++ b/src/bot/instance.rs
@@ -63,23 +63,23 @@ impl Config {
         self
     }
 
-    pub fn human(mut self) -> Self {
-        self.human = true;
+    pub fn human(mut self, human: bool) -> Self {
+        self.human = human;
         self
     }
 
-    pub fn bot(mut self) -> Self {
-        self.human = false;
+    pub fn cookies(mut self, cookies: Arc<Mutex<CookieJar>>) -> Self {
+        self.cookies = cookies;
         self
     }
 
-    pub fn username<S: ToString>(mut self, username: S) -> Self {
-        self.username = Some(username.to_string());
+    pub fn username<S: ToString>(mut self, username: Option<S>) -> Self {
+        self.username = username.map(|s| s.to_string());
         self
     }
 
-    pub fn password<S: ToString>(mut self, password: S) -> Self {
-        self.password = Some(password.to_string());
+    pub fn password<S: ToString>(mut self, password: Option<S>) -> Self {
+        self.password = password.map(|s| s.to_string());
         self
     }