Add preview instructions to Census Data process page

content/docs/processes/statistical_products/statistics_canada/census_data.md

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+
 Look through our [process-statcan-data-labs](https://github.com/dataforcanada/process-statcan-data-labs) repo for the datasets processed. There is still lots of work to do to make it ready for systems.
+
 ## Download
 
-Here is a table of some of the datasets created from the current process.
+Below is a table of datasets generated from our current processing pipeline. You can download the raw **Parquet** files directly or use the **Map Preview** links to inspect the data as vector tiles.
+
+### How to use the Map Preview
+
+The map preview allows you to visualize specific census characteristics dynamically. Follow this workflow to verify the data before downloading.
+
+**1. Identify your Characteristic ID**
+Census variables are mapped using numeric IDs. Consult the **[Characteristic ID Reference Sheet](https://1drv.ms/x/c/d42308bcd3b7a4a1/ESlrAmKqXp9BnsMXqurcB0sB9qy1r2-ZV8tCL9nCns_Mpg?e=8qIroJ)** to find the ID for the data you want to view.
+
+* *Example:* The ID for "Number of COVID-19 emergency and recovery benefits recipients..." is **124**.
+
+**2. Open the Preview**
+Click the link in the **Dataset ID & Preview** column for your desired geographic level (e.g., Provinces, Federal Electoral Districts).
+
+**3. Filter by Attribute**
+In the top-right "Search fields" box, enter the attribute key using the format `{gender}_{ID}`:
+
+* **Total:** Enter `total_124`
+* **Male:** Enter `men_124`
+* **Female:** Enter `women_124`
+
+**4. Update the Map**
+Click the **"Recalculate Classes"** button. This will refresh the map legend and choropleth coloring based on the currently visible extent.
+
+{{< callout type="info">}}
+**Note on Data Availability:** Dissemination blocks currently only contain these **[4 specific characteristics](https://github.com/dataforcanada/process-statcan-data-labs/issues/6)**.
+{{< /callout >}}
+
+{{< callout type="note">}}
+**Credit:** The location search functionality in our map previews is powered by the **[PHAC Geocoder](https://geocoder.alpha.phac.gc.ca/)**.
+{{< /callout >}}
 
 | Place  | ISO | Date | Provider | Dataset ID & Preview                                                                                                                                                                                               | Parquet                                                                                                                                                       |
 | ------ | --- | ---- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------- |