Okay, here are several options for a WordPress post_tag description for the title “益生菌哪裡買” (“Where to Buy Probiotics”) in Traditional Chinese, ranging from simple to more descriptive:

**Option 1: Simple & Direct**

* **Description:** 益生菌購買地點，提供您購買益生菌的資訊。 (Probiotic purchase locations, providing you with information on where to buy probiotics.)

**Option 2: Slightly More Informative:**

* **Description:** 想知道哪裡可以買到優質的益生菌嗎？這裡提供各種益生菌的購買通路和建議。 (Do you want to know where you can buy high-quality probiotics? This provides information on the purchase channels and recommendations for various probiotics.)

**Option 3: Focusing on Variety:**

* **Description:** 探索各種益生菌購買選擇，包括藥局、健康食品店、網路商店等。 找到最適合您的益生菌！ (Explore various probiotic purchase options, including pharmacies, health food stores, online stores, etc. Find the probiotics that are right for you!)

**Option 4: Keyword-Rich (Good for SEO):**

* **Description:** 尋找益生菌購買地點？我們整理了藥局、健康食品店、屈臣氏、網路商店等益生菌專賣商店資訊，幫助您快速找到適合您的益生菌產品。 (Looking for where to buy probiotics? We’ve compiled information on pharmacies, health food stores, Watsons, online stores, and other probiotic specialty stores to help you quickly find the right probiotic products for you.)

**Option 5: Emphasizing Recommendation:**

* **Description:** 想購買優質益生菌？ 這裡提供推薦購買地點，並分享挑选益生菌的建議和注意事項，幫助您做出最佳選擇！ (Want to buy high-quality probiotics? We provide recommended purchase locations here, and share suggestions and important notes on picking probiotics, helping you make the best choice!)

**Recommendation:**

I would recommend either **Option 2 or Option 4**. They are both informative and will draw in relevant readers looking for this information. Option 4 is particularly good if you’re trying to rank on search engines (SEO), since it is more keyword-rich.

**How to Use in WordPress:**

1. **Go to your WordPress admin area:** You are already familiar with the WordPress backend.
2. **Go to “Posts” and either add a new post, or edit an existing one that uses the “益生菌哪裡買” tag.**
3. **Locate “Tags” section:** Usually on the right-hand sidebar (in the “document” tab), you should find a panel labeled “Tags.”
4. **Click on the tag “益生菌哪裡買” (or add a new tag).**
5. **Look for the description field:** WordPress might not show the description immediately, so you may need to select the tag and then modify it. Other plugins can sometimes place the description field elsewhere.
6. **Paste the description:** Copy one of the above descriptions and paste it into the description field.
7. **Save the tag:** Save the tag or the post to which you’ve added or modified it.
8. **Check the category page:** Check what your category looks like on the front end to make sure the description appears.

Remember to tailor the description choice to the specific content of your related post(s)!