diff --git a/config.yaml b/config.yaml
index 0591c2f..fd7098a 100644
--- a/config.yaml
+++ b/config.yaml
@@ -1,22 +1,14 @@
-# The title is the title of your Add-On
 title: User Upload Frequency Graph
-# The description will be shown above the form when activating the Add-On
-description: This add-on will generate a graph of user upload frequency.
-# Add-On specific instructions here. Optional
+description: This add-on will generate a graph that shows the upload frequency for a particular user. 
 instructions: ''
-# Type should always be object
 type: object
-# How does this add-on accept documents
-# If more than one type is specified, the user will be prompted to choose one
 documents: []
-# Properties are the fields for your form
 properties:
-  # the key is the name of the variable that will be returned to your code
-  name:
-    # the title is what will be shown as the form label
-    title: Username
-    # a string is text
-    type: string
+  user_id:
+    title: User ID
+    type: integer
+required:
+  - user_id
 categories:
   - statistical
 
diff --git a/main.py b/main.py
index 0a26d6b..bf6df60 100644
--- a/main.py
+++ b/main.py
@@ -11,7 +11,7 @@
 class UploadGraph(AddOn):
     def create_df(self, doc_dates):
         df = pd.DataFrame(doc_dates, columns=["datetime"])
-        df["datetime"] = df["datetime"].astype("datetime64")
+        df["datetime"] = pd.to_datetime(df["datetime"]).dt.tz_localize(None)
         df["date"] = df["datetime"].dt.date
         df = df.sort_values(by="date")
         df.insert(0, "count", range(1, 1 + len(df)))
@@ -19,9 +19,10 @@ def create_df(self, doc_dates):
 
     def main(self):
         # fetch your add-on specific data
-        username = self.data.get("name", "world")
-
-        query = "+user:" + username
+        user_id = self.data.get("user_id")
+        user = self.client.users.get(user_id)
+        user_name = user.username
+        query = "+user:" + str(user_id)
 
         documents = self.client.documents.search(query)
 
@@ -35,7 +36,7 @@ def main(self):
             y="count",
             kind="line",
             x="date",
-            title=username + ": Uploads Over Time",
+            title=user_name + ": Uploads Over Time",
             figsize=(12, 8),
         )